Yellow light should be clearly visible from the working distance, but without dazzling the angler. After activation, give the ampoule time to reach an even brightness and check it in the dark before casting. The 12 hours are a guideline in normal use, not a reason to miss a spare number. Temperature, age of packaging and storage mode can affect practical duration.
Mount the glow element so that it does not injure the fishing line and is not released in a strong cast. If it's on a float, do a sample near the shore and see if the extra mass changes the rough or visible portion of the antenna. In another signalling rig, check the free movement of the line. A small accessory can change sensitivity when the tackle is very fine.
Keep inactivated ampoules in their closed packaging, away from direct sunlight and sharp objects. Do not use a damaged or leaky ampoule and do not leave it by the water after fishing. The practical kit includes the right holder, dry reserve and a small box for the items used. Thus, the night indication remains predictable without making unverified inferences about other products named Behr.
About the related review Swimwear, floats for float fishing, useful accessories for float and lamps and headlight. Arrange lighting and signaling according to the entire night outing, not as a separate purchase.